Dell Inspiron 1320 Replacement Battery 11.1V 4400mAh Y264R

Dell Inspiron 1320 / 1320n — 11.1V Li-ion Replacement Battery (Y264R)

This 11.1V, 4400mAh (48.84Wh) Li-ion battery replaces the original cell in the Dell Inspiron 1320 and 1320n notebooks. OEM part numbers Y264R, F136T, and D181T all cross to this unit. It slots into the same bay and connects to the same BMS interface as the factory cell.

• Inspiron 1320 and 1320n compatibility: Both models share the same 11.1V three-cell battery bay, connector pinout, and BMS handshake protocol. One replacement covers either variant without modification.
• Bench tested on actual hardware: We ran this cell on an Inspiron 1320 and confirmed the BMS completed its initialisation handshake, the charge circuit engaged correctly, and the cell held voltage through a full discharge cycle without triggering a premature cutoff.
• Post-install calibration cycle: After fitting this battery, run the laptop down to hibernate-cutoff on battery alone, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell's actual capacity and clears the inaccurate health warning that appears after every cell swap.

BIOS reporting poor battery health immediately after fitting a new cell

The Inspiron 1320 BIOS stores battery health data in EEPROM and compares it against the new cell on first boot. Because the EEPROM still holds wear data from the old cell, it flags the replacement as degraded before any calibration has occurred. This is not a fault in the new battery — it is a data mismatch. Run one full discharge-to-hibernate then charge to 100%, and the BIOS learn cycle overwrites the stale EEPROM values. After one or two cycles the health indicator normalises.

Laptop shuts down abruptly at 20–30% charge shown on screen

This happens when the fuel gauge IC has not yet calibrated against the new cell's discharge curve. The gauge estimates remaining capacity based on old curve data and calls a shutdown before the cell is actually exhausted. The fix is the same calibration cycle — drain to hibernate-cutoff, charge to 100% without interruption, repeat twice. After two full cycles the gauge IC locks onto the correct curve and the early-shutdown behaviour stops. If it persists past three cycles, check that the AC adapter is delivering a stable 19.5V under load.